Of course it is
Only if it culminates in orgasm
It is not sex
Honestly, I think you are indulging in semantics. The naming of a sexual behaviour as 'sex' or 'sex act' means nothing whatsoever in practical, moral or philosophical terms, it's just linguistic masturbation. That's neither 'sex' nor a 'sex act', BTW.
"Austerity is used as a cover to reconfigure society and increase inequality and injustice." - Jeremy Corbyn
Virginity tends to be a specific cultural reference to loss of the hymen in girls, and vaginal penetration by males.
It's actually kind of mythological since many athletic girls lose their hymens long before they are vaginally penetrated by a man.